Role of the anatase/TiO2(B) heterointerface for ultrastable high-rate lithium and sodium energy storage performance. Issue 1 (10th September 2019)

• Record Type: Journal Article
• Authors: Liu, Guilong; Wu, Hong-Hui; Meng, Qiangqiang; Zhang, Ting; Sun, Dong; Jin, Xueyang; Guo, Donglei; Wu, Naiteng; Liu, Xianming; Kim, Jang-Kyo
• Is Part Of: Nanoscale horizons. Volume 5:Issue 1(2020)
• Page Start: 150
• Page End: 162
• Publication Date: 2019-09-10
• Subjects: Nanoscience -- Periodicals; Nanotechnology -- Periodicals; 620.505
• DOI: 10.1039/c9nh00402e
• Languages: English
• ISSNs: 2055-6756

Abstract

Abstract : An 'ion reservoir', from an internal electric field and lower Li + /Na + adsorption energies at an anatase/TiO2 (B) interface, ameliorated Li + /Na + storage. Abstract : This paper is dedicated to elucidating the role of the anatase/TiO2 (B) heterointerface, which functions as an 'ion reservoir' for dominant pseudocapacitance, for ultrastable high-rate energy storage in both Li-ion and Na-ion batteries (LIBs, SIBs). Dual-phase nanosheets are in situ assembled to form anatase/TiO2 (B) nanoflower-shaped anodes via a facile hydrothermal and thermolysis process. The abundant oxygen vacancies on the ultrathin nanosheets favor pseudocapacitive behaviors and fast ionic/electronic transport during Li + /Na + insertion/extraction cycles. The density functional theory calculations combined with ab initio molecular dynamics simulations corroborate the important role of the anatase/TiO2 (B) heterointerface in promoting electrochemical kinetics. The heterointerface has much lower adsorption energies of Li + /Na + than in each phase acting alone, and the presence of an internal electric field with a high ionic concentration at the interface ameliorates charge transport. Therefore, the dual-phase anodes deliver ultrastable electrochemical performance with high specific capacities of 193 and 112 mA h g −1 at an exceptionally fast 20 C in LIBs and SIBs, respectively. Their cycling stability is equally remarkable, sustaining reversible capacities of 212 mA h g −1 at 10 C and 173 mA h g −1 at 5 C after 1000 cycles, respectively. These new findings may help rationally design high-performance multi-functional anodes for next-generation metal-ion batteries.